Breaking "bugfixes" for an eventual 3.0

[nathanhammond]

These are things that are very much broken but we can't change for reasons of backwards compatibility. This list is for a very specific category of issue. These should tend toward mechanical changes.

When you comment on this thread please identify why your issue fits this category. The canonical list will be hoisted here. Comments will only be used to identify which things should be promoted to this top post.

• [ ] Stop defining globals in vendor-prefix.js.
• [ ] Remove deprecateUI (Standard deprecation removal.)

[kellyselden]

remove https://github.com/ember-cli/ember-cli/blob/375f3a32f4564465d2eccc3815cb61b570ce29f0/lib/utilities/deprecate.js

normal deprecation removal.